2014 and 2015 Corruption Perceptions Index

Berlin, 13 September 2017 – The Corruption Perceptions Index (CPI) results tables for 2014 and 2015 have been corrected for a number of countries because of an error discovered during a review of past CPI results. The mistake was due to a human error in transferring data from specific sources to the CPI computation files at Transparency International’s Secretariat.

In 2014, the error affected three countries. In 2015 a similar mistake affected 11 countries. These incorrect scores also changed the ranks of 21 additional countries/territories in 2014 and 31 countries/territories in 2015 by one position.

All scores and ranks have been corrected. All website content referring to the countries in question has also been amended. All other results remain unchanged.

2014 Corruption Perceptions Index

Because of the error the 2014 CPI did not include Saint Lucia as it did not appear to have the requisite three data sources. It is now included. But the 2014 CPI did include Samoa, which should not have been included because it only had two data sources. The error also led to a revision in the score for Saint Vincent and Grenadines from 67 to 62. These mistakes have now been corrected.

2015 Corruption Perceptions Index

The following countries have had their 2015 CPI scores corrected:

Country

Published CPI 2015

Revised CPI 2015

New Zealand

88

91

Norway

87

88

Luxembourg

81

85

Netherlands

87

84

Portugal

63

64

Poland

62

63

Malta

56

60

Lithuania

61

59

Latvia

55

56

Korea (South)

56

54

Mexico

35

31

In order to prevent any future mistakes of this kind, the verification procedures used for the CPI have been strengthened as of 2016, including among other things external, completely independent calculations of the results. Going forward the level of quality control will be increased to further reduce the risk of human error.

The source description document has also been updated to clarify the underlying questions asked by the CPI sources and how this data is used in the CPI calculations.

The methodology used for calculating the CPI since 2012 remains strong and valid, and will continue to be used in future editions of the CPI.